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The duty uniform worn consisted of dark gray trousers and a division color top, following the below color code. The previous EarthStarfleet style of wearing a patch based on assignment continued, but the patch was moved to the chest. Rank was displayed by sleeve stripes. (TOS: "The Cage") The top's collar initially had a "bubbled" appearance but many of them came straight up on the neck later on. (TOS: "Where No Man Has Gone Before")

There was a dress jacket, edged with gold trim, with matching epaulets. This was most likely a matching shade to the division color, in this case although it looks brown over gold, they were both actually green. Since no other dress uniforms from this period were ever seen it is impossible to know for sure. (TOS: "The Cage")

Work coveralls, with assignment patch embroidered on the breast, were issued in all division related colors. Instead of the brighter colors of the duty uniform, they were in muted colors of olive (Command), khaki (Operations) and blue-gray (Sciences). (TOS: "The Cage")

In the mid-23rd century, a Starfleetcadet wore a version of the standard duty uniform, with a tunic top made out of a reflective gray material tunic top, a V-shaped black collar, and black trousers. A Starfleet assignment patch insignia, a ten pointed star, was worn on the left breast. (TOS: "Shore Leave")

The original command "greenish-gold" uniforms were actually lime-green off camera, away from the stage lights. [1] Also, some have described the "khaki-beige" operations uniforms as "gold", leading to confusion over the fact they they were two distinct colors. The re-mastered episodes restore the original colors and clear distinction between the uniforms.

Assignment patches were worn on many of the uniform styles, and were individual depending on a serviceperson's posting. A departmental insignia of the person's position was located in the center of many of these patches

During this period, it was not uncommon to see department insignia which did not correspond to a specific departmental color uniform, as was standardized by 2266. In particular the following division color/insignia combinations have been seen: command/operations, operations/sciences, sciences/operations and sciences/command. In addition, security personnel circa 2254 wore blue uniforms with a unique insignia. However, by 2265 this insignia was dropped in favor of the current operations insignia.

Although the standard command division uniform tunics looked gold on most color TV sets, the costumes were actually lime green[2]. The greenish hue of the command tunics can be seen more clearly in the third season, when the fabric used for the tunics was changed from satin velour to a double-knit nylon that reflected the set lighting differently. The dress uniforms, made of a silk material, were always clearly green by comparison, and some darker green jumpsuits and wraparound tunics that were more clearly seen seemed to confirm that all the "gold-to-green" variations were part of the same color scheme. The so-called "beige" uniforms which originated with "The Cage" were ironically a much more yellow color, but likewise appeared beige or pinkish under the lights.

In the IDW comic series Crew, engineering officers were depicted as wearing a red uniform, with a red collar, alongside the beige uniforms as depicted in "The Cage" and "Where No Man Has Gone Before". In particular, these uniforms were depicted as only being worn in engineering, rather than elsewhere on the Enterprise, suggesting that since the engineering section of the Enterprise was never depicted during this era of TOS, such uniforms could have actually existed side-by-side with the beige Operations uniforms, thereby continuing the red division color established in Enterprise.